Cable modem



FIG. 1 is a perspective view of a cable modem showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a front elevation view thereof.

The broken lines shown in the drawings represent environment only. 

The ornamental design for a cable modem, as shown and described. 